{"id":"CVE-2026-89459","title":"kernel: s390/percpu: Fix MVIY_PERCPU() with older binutils (CVE-2026-89459)","summary":"A flaw was found in the Linux kernel's s390/percpu component. This vulnerability arises when the kernel is compiled with older versions of GNU as (prior to binutils 2.39). A parsing error prevents a crucial instruction from being correctly…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-88","vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 4","affected":["openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-15","sourceUpdated":"2026-09-15T10:31:23+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89459.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89459.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89459"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532530"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89459"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89459"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89459.mbox"},{"url":"https://git.kernel.org/stable/c/101782f8945a125044347312d74d488c05741c4a"},{"url":"https://git.kernel.org/stable/c/91770b08a120967077ae78600612f18bc5ee3caf"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00108,"epssPercentile":0.01357,"scores":{"vendor":4.1,"cna":7},"ingestedAt":"2026-09-14T15:23:07.475Z","slug":"CVE-2026-89459","body":"## Overview\n\nA flaw was found in the Linux kernel's s390/percpu component. This vulnerability arises when the kernel is compiled with older versions of GNU as (prior to binutils 2.39). A parsing error prevents a crucial instruction from being correctly processed, which can lead to issues with system resource management after a process migrates between CPUs. This can result in system instability and potentially a Denial of Service (DoS).\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89459.json)\n\n**kernel: s390/percpu: Fix MVIY_PERCPU() with older binutils** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-15.\n\nNot affected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nRefer to the advisory for fix availability.","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":203918,"id":"CVE-2026-89459","ts":1789490221682,"field":"cvss","old":"4.1","new":"5.5"},{"seq":202787,"id":"CVE-2026-89459","ts":1789403721195,"field":"cvss","old":"7","new":"4.1"},{"seq":202786,"id":"CVE-2026-89459","ts":1789403721195,"field":"severity","old":"high","new":"medium"},{"seq":198046,"id":"CVE-2026-89459","ts":1789384321532,"field":"cvss","old":"4.1","new":"7"},{"seq":198045,"id":"CVE-2026-89459","ts":1789384321532,"field":"severity","old":"medium","new":"high"},{"seq":183536,"id":"CVE-2026-89459","ts":1789356675788,"field":"cvss","old":"7","new":"4.1"},{"seq":183535,"id":"CVE-2026-89459","ts":1789356675788,"field":"severity","old":"high","new":"medium"},{"seq":153238,"id":"CVE-2026-89459","ts":1789285349682,"field":"cvss","old":null,"new":"7"},{"seq":153237,"id":"CVE-2026-89459","ts":1789285349682,"field":"severity","old":"none","new":"high"},{"seq":147063,"id":"CVE-2026-89459","ts":1789270195011,"field":"cvss","old":null,"new":"4.1"},{"seq":147062,"id":"CVE-2026-89459","ts":1789270195011,"field":"severity","old":"none","new":"medium"}]}